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Heat treatment of hand tightening tools
Gregor, Martin ; Kouřil, Miloslav (referee) ; Doležal, Pavel (advisor)
Bachelor´s thesis deals with problems of heat treatment of hand tightening tools. Literary analysis is focused on the principles of heat treatment such as annealing, austenitizing, quenching and tempering. Attention is also focused on unconventional heat treatment technology using vacuum and furnace atmospheres based on nitrogen. Analysis of dividing and heat treatment of tool steels is another subject of literary research. In the experimental part are machinery and technological progress of the stock in the company Wera Werk s.r.o., which has more than 50 years engaged in the manufacture, sales and innovation of hand tightening tools. Following processing of the experimental material with a focus on heat treatment and mechanical properties indicate in laboratory tests. Based on the measured and statistically processed values of mechanical quantities is developed design optimization process of heat treatment of hand tightening tools of Wera Werk.
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Influence of the electron beam trajectory on the surface properties of steel 42CrMo4
Mikuš, Tomáš ; Kouřil, Miloslav (referee) ; Foret, Rudolf (advisor)
The thesis deals with surface quenching of steel 42CrMo4 by electron beam. Influence of technologic parameters and beam deflection on properties and structure of prepared layers is studied. Electron beam surface quenching was applicated with and without melting of the surface. Structures of layers made by electron beam quenching were compared with structures made by laser and electromagnetic induction. Structures and phases were analysed by optical microscopy, SEM and roentgen diffraction. Hardness was measured on hardened layers.
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FITkit - PC Crypted Communication
Kouřil, Miroslav ; Strnadel, Josef (referee) ; Růžička, Richard (advisor)
This thesis deals with the issue of concealing confidential data being transmitted in between two systems. The coding standard AES as a block symmetric cipher has been selected. In practise, the connection between the FITkit platform and a PC was set via serial communication. The FITkit is programmed in language C and the PC in language C++ . There has been designed a simple protocol for setting up the connection and for the information exchange about encoding. Due to the difficulties with serial communication on the kit side there have been created two applications. The first application reads encoded kit data and translates them with the assistance of preset values. The second one communicates with the kit emulator on the other computer and works at full range, what means - establishing the connection, generating keys modes and number of encoding rounds, safe key exchange and the possibility of data reading and writing to the kit.
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The Efficient Implementation of the Genetic Algorithm Using Multicore Processors
Kouřil, Miroslav ; Žaloudek, Luděk (referee) ; Jaroš, Jiří (advisor)
This diploma thesis deals with acceleration of advanced genetic algorithm. For implementation, discrete and continuos versions of UMDA genetic algorithm were chosen. The main part of the acceleration is the utilization of SSE instruction set. Using this set, the functions for calculating fitness and new population sampling were accelerated in particular. Then the pseudorandom number generator that also uses SSE instruction set was implemented. The discrete algorithm reached the speed of up to 4,6 after this implementation. Finally, the algorithms were modified so that the system OpenMP could be used, which enables the running of blocks of code in more threads. The continuous version of algorithm is not convenient for parallelization, because computational complexity of that algorithm is low. In comparison, the discrete versions of algorithm are really appropriate for parallelization. Both the implemented versions reached the total acceleration of up to 4,9 and 7,2.
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Tool life of ADMX inserts for milling of the S-grade materials
Tejkl, Jakub ; Kouřil, Miroslav (referee) ; Píška, Miroslav (advisor)
This diploma thesis studies the machining of group S materials. In the theoretical part of this thesis these materials were divided into groups and subsequently analyzed. These materials were also analyzed in terms of their impaired machinability. In the practical part of this thesis experimental tests were conducted to determine tool life, tool wear and in the case of testing titanium alloy surface roughness too.
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Possibilities of minimalization of induced drag
Skarolek, Vilém ; Kouřil, Martin (referee) ; Lajza, Ondřej (advisor)
Lift-induced drag is a significant part of total drag of airplane during flight, thus its minimization is desirable for economical operation of air service. This bachelor thesis deals with possibilities of induced drag minimization. First part of this thesis presents basics of induced drag origin during flight. The second part of the thesis contains overview of potential methods of induced drag minimization, their description and structural design, including comparison of particular methods of drag minimization.
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